[1] At the age of 40, he was elected one of four communal leaders of Prague's Jewish community, but later settled in Vienna.
[1] He devoted himself to the study of Oriental languages and literature under the direction of his brother Baruch Jeitteles.
[3] He was the first to compose in Hebrew a grammar of Biblical Aramaic,[3] its title being Mevo lashon Aramit (Prague, 1813).
He edited and wrote commentaries on the books of Samuel, Kings, the Twelve Minor Prophets, Chronicles, Ezra, Nehemiah, and Daniel for Anton Edler von Schmid's new (fourth) edition of the Bible with German translation.
[7] He left in manuscript a complete Aramaic-German dictionary, which explains especially the root words of the Aramaicisms occurring in the Hebrew text of the Tanakh.